The lift-up effect : The linear mechanism behind transition and turbulence in shear flows
By Luca Brandt. 2014
184 citations recorded by the source corpus.
The formation and amplification of streamwise velocity perturbations induced by cross-stream disturbances is ubiquitous in shear flows. This disturbance growth mechanism, so neatly identified by Ellingsen and Palm in 1975, is a key process in transition to turbulence and self-sustained turbulence. In this review, we first present the original derivation and early studies and then discuss the non-modal growth of streaks, the result of the lift-up process, in transitional and turbulent shear flows. In the second part, the effects on the lift-up process of additives in the fluid and of a second phase are discussed and new results presented with emphasis on particle-laden shear flows. For all cases considered, we see the lift-up process to be a very robust process, always present as a first step in subcritical transition.
Subfields: Computational Mechanics, Ecology, Global and Planetary Change
View Paper: https://www.semanticscholar.org/paper/61dc2f5f80eb77dcf44153a111ffe1a2333df7b9
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In Computational Mechanics
- Luca Brandt
- B. McKeon
- Francesco Picano
- Wim-Paul Breugem
- Ati S. Sharma
- C. Cossu
- Ivan Marusic
- Tamer A. Zaki
In Ecology
In Global and Planetary Change
Citations in the corpus
- The engine behind (wall) turbulence: perspectives on scale interactions (2017, methodology): “Further, the mechanisms of energy growth are of a three-dimensional nature, and have distinct analogy to the lift-up and Orr tilting mechanisms familiar from linear stability work, as reviewed by, e.g., Brandt (2014) and Jiménez (2015).”
- Turbulent channel flow of dense suspensions of neutrally buoyant spheres (2014, background): “These values reflect the typical structures of wall-bounded turbulence, i.e. quasistreamwise vortices and low speed streaks that sustain the turbulence process (Pope 2000; Kim et al. 1987; Waleffe 1997; Brandt 2014).”